I updated PP & ME CC2015 a while back, and checked the Advanced option/do not get rid of older versions (a lot of projects in the pipeline at the time -- need to stay CC2014).
Things have settled down a bit and I wanted to start exploring CC2015. I'm downloading other programs (AE, SG, PS etc.) and am seeing the Advanced option/do not delete button, but on PP & ME I don't get that option. Is this because I already have an earlier version of those 2015 packages on my system, and don't have to worry about deleting CC2014?
I still have on-going projects that I'd like to keep in CC2014, so am a bit paranoid.